ROLE OF PARTICLES AND DISPERSIONS IN ELECTROPHOTOGRAPHY

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Abstract
The genesis of a 30 billion dollar a year electrophotographic industry can be traced to the sole effort of Chester Carlson who demonstrated in 1938 that dry images could be produced by a new process involving the attraction of charged pigmented particles to an electrostatic image formed on a photoconducting film. Carlson's invention, a particular form of electrophotography, is known as xerography. Most electrophotographic processes are based on the deposition of charged particles in either an air or liquid medium. The marking particles are usually pigments dispersed in a polymer matrix. The various electrophotographic processes are critically dependent on the electrical and mechanical properties of particles and dispersions. We examine the role of particles and dispersions in electrophotographic processes in general, and xerographic processes in particular.

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